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Division of Ferrofluid Drops Induced by a Magnetic Field.
Langmuir. 2018 08 21; 34(33):9762-9767.L

Abstract

We report a comprehensive study of the division of ferrofluid drops caused by their interaction with a permanent magnet. As the magnet gradually approaches the sessile drop, the drop deforms into a spiked cone and then divides into two daughter droplets. This process is the result of a complex interplay between the polarizing effect caused by the magnetic field and the magnetic attraction due to the field gradient. As a first attempt to describe it, during each scan we identify two characteristic distances between the magnet and the drop: zmax, corresponding to the drop reaching its maximum height, and zsaddle, corresponding to the formation of a saddle point on the drop peak identifying the beginning of the drop breakup. We have investigated the location of these two points using sessile drops of ferrofluid water solutions at various concentrations and volumes, deposited on four surfaces of different wettability. An empirical scaling law based on dimensionless variables is found to accurately describe these experimental observations. We have also measured the maximum diameter of the drops right before the division and found that it is very close to a critical size, which depends on the magnetic attraction.

Authors+Show Affiliations

Dipartimento di Fisica e Astronomia "G. Galilei" , Università di Padova , via Marzolo 8 , Padova 35131 , Italy.Dipartimento di Fisica e Astronomia "G. Galilei" , Università di Padova , via Marzolo 8 , Padova 35131 , Italy.Dipartimento di Fisica e Astronomia "G. Galilei" , Università di Padova , via Marzolo 8 , Padova 35131 , Italy.Laboratoire PHysico-chimie des Electrolytes et Nanosystèmes, PHENIX , Sorbonne Université, CNRS , Paris F-75005 , France.Laboratoire PHysico-chimie des Electrolytes et Nanosystèmes, PHENIX , Sorbonne Université, CNRS , Paris F-75005 , France.Dipartimento di Fisica e Astronomia "G. Galilei" , Università di Padova , via Marzolo 8 , Padova 35131 , Italy.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30060659

Citation

Rigoni, Carlo, et al. "Division of Ferrofluid Drops Induced By a Magnetic Field." Langmuir : the ACS Journal of Surfaces and Colloids, vol. 34, no. 33, 2018, pp. 9762-9767.
Rigoni C, Bertoldo S, Pierno M, et al. Division of Ferrofluid Drops Induced by a Magnetic Field. Langmuir. 2018;34(33):9762-9767.
Rigoni, C., Bertoldo, S., Pierno, M., Talbot, D., Abou-Hassan, A., & Mistura, G. (2018). Division of Ferrofluid Drops Induced by a Magnetic Field. Langmuir : the ACS Journal of Surfaces and Colloids, 34(33), 9762-9767. https://doi.org/10.1021/acs.langmuir.8b02399
Rigoni C, et al. Division of Ferrofluid Drops Induced By a Magnetic Field. Langmuir. 2018 08 21;34(33):9762-9767. PubMed PMID: 30060659.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Division of Ferrofluid Drops Induced by a Magnetic Field. AU - Rigoni,Carlo, AU - Bertoldo,Stefano, AU - Pierno,Matteo, AU - Talbot,Delphine, AU - Abou-Hassan,Ali, AU - Mistura,Giampaolo, Y1 - 2018/08/10/ PY - 2018/8/1/pubmed PY - 2018/8/1/medline PY - 2018/8/1/entrez SP - 9762 EP - 9767 JF - Langmuir : the ACS journal of surfaces and colloids JO - Langmuir VL - 34 IS - 33 N2 - We report a comprehensive study of the division of ferrofluid drops caused by their interaction with a permanent magnet. As the magnet gradually approaches the sessile drop, the drop deforms into a spiked cone and then divides into two daughter droplets. This process is the result of a complex interplay between the polarizing effect caused by the magnetic field and the magnetic attraction due to the field gradient. As a first attempt to describe it, during each scan we identify two characteristic distances between the magnet and the drop: zmax, corresponding to the drop reaching its maximum height, and zsaddle, corresponding to the formation of a saddle point on the drop peak identifying the beginning of the drop breakup. We have investigated the location of these two points using sessile drops of ferrofluid water solutions at various concentrations and volumes, deposited on four surfaces of different wettability. An empirical scaling law based on dimensionless variables is found to accurately describe these experimental observations. We have also measured the maximum diameter of the drops right before the division and found that it is very close to a critical size, which depends on the magnetic attraction. SN - 1520-5827 UR - https://www.unboundmedicine.com/medline/citation/30060659/Division_of_Ferrofluid_Drops_Induced_by_a_Magnetic_Field L2 - https://dx.doi.org/10.1021/acs.langmuir.8b02399 DB - PRIME DP - Unbound Medicine ER -
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